WO2010050532A1 - 無線通信システム、中継システム、中継装置、及び、同期方法 - Google Patents
無線通信システム、中継システム、中継装置、及び、同期方法 Download PDFInfo
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- WO2010050532A1 WO2010050532A1 PCT/JP2009/068536 JP2009068536W WO2010050532A1 WO 2010050532 A1 WO2010050532 A1 WO 2010050532A1 JP 2009068536 W JP2009068536 W JP 2009068536W WO 2010050532 A1 WO2010050532 A1 WO 2010050532A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a wireless communication system, a relay system, a relay device, and a synchronization method.
- a trunking wireless communication system (hereinafter referred to as “trunking system”) is known.
- the trunking system has a plurality of repeaters at one site, and a plurality of wireless terminal apparatuses share a plurality of call channels by a plurality of repeaters.
- the trunking system includes a so-called dedicated control system having a dedicated control channel and a so-called distributed control system having no dedicated control channel.
- a plurality of wireless terminal devices set an empty call channel based on control information from the control channel, and perform a call with each other via the empty call channel.
- a plurality of wireless terminal devices set an empty call channel based on control information from a home repeater registered in advance in each wireless terminal device, and call each other through the empty call channel.
- a master repeater functions as a master repeater and the other functions as a slave repeater.
- the slave repeater operates while synchronizing with the synchronization signal supplied from the master repeater.
- Patent Document 1 discloses a technique for automatically switching another repeater to a master repeater when a master repeater fails.
- a master repeater generates a synchronization signal and transmits it to a plurality of other slave repeaters.
- Each repeater is connected to another repeater by a sync signal connector for sending and receiving a sync signal, and is connected to another repeater by a LAN for control communication related to connection of a communication channel.
- a control channel is set in a dedicated control method, and a call channel is set based on control information from a home repeater in a distributed control method. That is, in the trunking system, the wireless terminal device does not always make a call on the same call channel, and the call channel is changed as necessary.
- the operation of the repeater and the operation of the wireless terminal device may not be synchronized when the call channel is changed.
- the wireless terminal device may not be able to receive it in synchronization with the communication frame transmitted by the repeater. If the detection of frame synchronization by the wireless terminal device is delayed, the reception data of the wireless terminal device will be in a state of being truncated.
- Patent Document 1 discloses a technique for ensuring synchronization among a plurality of repeaters by switching another repeater to a master repeater when a master repeater fails. However, it does not disclose anything about establishing frame synchronization at high speed when the call channel is changed.
- a dedicated signal line for a synchronization signal is provided separately from a signal line for control related to connection of a communication channel, which increases the cost of the repeater. Invite.
- the present invention solves the above-described problem, and provides a wireless communication system, a relay system, a relay device, and a synchronization method thereof that can easily synchronize a wireless signal when a wireless terminal device changes a channel.
- the purpose is to provide.
- the present invention also provides a wireless terminal device that changes channels without providing a dedicated signal line in the repeater to synchronize channel changes, and without providing an expensive receiving circuit or control circuit in the wireless terminal device.
- An object of the present invention is to provide a radio communication system, a relay system, a relay device, and a synchronization method thereof that can quickly synchronize radio signals.
- a wireless communication system includes: A relay system comprising a plurality of relay devices connected to each other via a communication line and assigned to each unique channel; A plurality of wireless terminal devices that perform communication via the relay system, Each relay device transmits control information to the wireless terminal device registered in itself, Each wireless terminal device receives the control information transmitted from the relay device with which it is registered, and based on the received control information, the channel is in a state in which it can be relayed from among the channels assigned to each relay device To communicate with other wireless terminal devices via the selected channel, Each relay device transmits / receives information constituting the control information by transmitting / receiving a communication signal via the communication line, and synchronizes a downlink signal transmitted by itself with the communication signal in the communication line, The wireless terminal device maintains a synchronization state established in the channel before the movement for at least a predetermined period when the channel for communication is moved to another channel. It is characterized by that.
- the unit length of the communication signal in the communication line and the length of the signal frame of the downlink signal transmitted by each relay apparatus are set to be the same.
- the relay system may include a master relay device that transmits a synchronization signal to the communication line and a slave relay device that acquires the synchronization signal from the communication line.
- the master relay device includes a synchronization circuit that generates a synchronization signal
- the slave relay device includes a synchronization circuit that oscillates in synchronization with the received synchronization signal
- the master relay device and the slave relay device transmit a downlink signal in synchronization with the synchronization signal
- the wireless terminal device includes a synchronization circuit that synchronizes with a received downlink signal, and the synchronization circuit can maintain an established synchronization state for one synchronization period or more.
- Each of the relay devices transmits information held by itself to the position assigned to itself in the communication signal of the communication line. Further, each of the relay devices can receive another relay device from the communication frame of the communication line. It is also possible to acquire information that is held and to build control information that is transmitted wirelessly by itself.
- a relay system comprising a plurality of relay devices connected to each other via a communication line and assigned with a unique relay channel, A master relay device that sends a synchronization signal for synchronizing the plurality of relay devices to the communication line; Via the communication line, to acquire the synchronization signal sent by the master relay device, comprising a slave relay device that operates in synchronization with the synchronization signal, It is characterized by that.
- a relay device provides: A relay device connected to a communication line and assigned a unique relay channel, An output unit that outputs self-information held by itself at a self-assigned position in the communication signal of the communication line; An input unit for inputting other information output by another relay device from the communication signal of the communication line; A processing unit for generating control information for controlling a wireless terminal device with which the wireless communication is performed based on the other information, The processing unit is configured to synchronize a downlink signal wirelessly transmitted by itself with a communication signal in the communication line. It is characterized by that.
- a synchronization method provides: A relay system including a plurality of relay devices that are connected to each other via a communication line and assigned with a unique relay channel is synchronized with a plurality of wireless terminal devices that perform communication via the relay system.
- a synchronization method A transmission step in which the relay device transmits control information to a wireless terminal device registered in the relay device; Based on the control information received from the relay device with which the wireless terminal device is registered, the wireless terminal device selects a channel that can be relayed from the channels assigned to each relay device and A communication process for performing communication,
- the relay device acquires information constituting the control information via the communication line, and synchronizes a downlink signal that is wirelessly transmitted by itself with a communication signal on the communication line,
- the communication step when the wireless terminal device moves a communication channel to another channel, the synchronization state established in the channel before the movement is maintained. It is characterized by that.
- site 100 of the wireless communication system includes a plurality (for example, a maximum of 30) repeaters 111 1 to 111 n .
- Each of the plurality of repeaters 111 1 to 111 n is assigned a unique relay channel, and is responsible for relay processing of the same communication area.
- the repeaters 111 1 to 111 n are connected to each other via a communication line 115 and constitute one repeater system (relay system) 130.
- the repeater system 130 forms one communication area having the number of channels n (n is the number of repeaters).
- the repeaters 111 1 to 111 n are connected to the server 104 via a communication line 116 such as an IP connection line. Since the communication line 115 is generally referred to as a “system bus”, the communication line 115 is referred to as a system bus in the following description.
- the server 104 can perform various settings of the plurality of repeaters 111 1 to 111 n by remote control.
- Each repeater 111 1 to 111 n includes a repeater unit and a controller unit. Further, each of the repeaters 111 1 to 111 n exchanges information about the repeaters 111 1 to 111 n (for example, information indicating whether or not relaying is being performed) via the system bus 115 and shares the information.
- Each repeater 111 1 ⁇ 111 n is set or transmits data in advance which time slot to the system bus 115. For this reason, each repeater 111 1 to 111 n sends data to a preset time slot.
- One of the plurality of repeaters 111 1 to 111 n is set as a “master repeater”.
- the repeater 111 1 is assumed to be a master repeater.
- the master repeater sends a synchronization signal for synchronizing the repeaters 111 1 to 111 n including its own device to the system bus 115.
- the wireless terminal devices TA to TH register any one of the repeaters 111 1 to 111 n as a home repeater. Similarly, each of the repeaters 111 1 to 111 n registers information of the wireless terminal devices TA to TH that use the repeaters 111 1 to 111 n as their home repeaters.
- Wireless terminal apparatuses TA to TH receive the home repeater downlink signal in the standby state.
- the wireless terminal devices TA to TH acquire the empty channel information inserted in the downlink signal of the home repeater, move the communication channel (channel used for communication) to the empty channel indicated by the empty channel information, and the empty channel Talk to other wireless terminal devices via When the call ends, the communication channel is returned to the home repeater channel, and the standby state is restored.
- the wireless terminal device TA ⁇ TD home repeater to repeater 111 1 the radio terminal equipment TE and TF home repeater to repeater 111 2
- the wireless terminal TG and TH is the repeater 111 3 as a home repeater.
- the wireless communication system of FIG. 1 is a distributed trunking system in which wireless terminal apparatuses TA to TH share a plurality of repeaters 111 1 to 111 n and at least one repeater is appropriately selected for relay.
- the distributed trunking system does not have a dedicated channel for control, and all the channels function as control channels as well as call channels.
- the wireless terminal device TA acquires channel information which indicates the call channels that can be included in the downlink signal from the repeater 111 1 which is its home repeater, which can call on the basis of the acquired channel information Identifies channels, one of the discriminated communicatable channels (e.g., channel repeater 111 3) is selected, to move the communication channel itself to the selected channel.
- the discriminated communicatable channels e.g., channel repeater 111 3
- the wireless terminal device TA transmits a call permission request to this channel (channel repeater 111 3 is provided), to establish a link receives a response indicating that allow calls from repeater 111 3.
- the home repeater 111 1 transmits to the wireless terminal TB ⁇ TD is the other party, a control signal for instructing the movement to the speech channel establishing a link (channel repeater 111 3) .
- the wireless terminal devices TB to TD change the call channel to the designated channel and perform a call with the wireless terminal device TA.
- the repeater 111 1 for the wireless terminal devices TA ⁇ TD that registers itself as a home repeater, and operates as a control channel, for other wireless terminal devices TE ⁇ TH operates as a telephone communication channel .
- the call between the radio terminal apparatuses TA to TD is a group call in the radio terminal apparatuses TA to TD as a whole or a small group composed of, for example, the radio terminal apparatuses TA and TB. Group calls or individual calls (referred to as “Individual Call”) for one wireless terminal device.
- FIG. 2 is a block diagram showing the configuration of the wireless terminal devices TA to TH of FIG.
- FIG. 3 is a block diagram showing a configuration of repeaters 111 1 to 111 n in FIG.
- Figure 4 is a diagram showing a time slot assigned from the master repeater 111 1 to each repeater following the synchronization signal and the synchronization signal is sent to the system bus 115.
- FIGS. 5A and 5B are diagrams illustrating a format of a communication frame transmitted and received between the repeater and the wireless terminal device.
- the communication frame is composed of a header part and a data part. Detailed contents of the header part and the data part will be described later.
- the radio terminal apparatuses TA to TH include an antenna ANTSR, a transmission / reception switching unit 11, a transmission unit 12, a baseband processing unit 13, an A / D conversion unit 14, a microphone 15 and a reception block as signal blocks.
- Unit 16 baseband processing unit 17, D / A conversion unit 18, and speaker 19.
- the wireless terminal devices TA to TH include a controller 20, a timer unit 25, a display unit 26, an operation unit 27, and a synchronization circuit 28 as control system blocks.
- the controller 20 further includes a CPU (central processing unit) 21, an I / O (input / output unit) 22, a RAM (read / write memory) 23, a ROM (read-only memory) 24, and an internal bus for connecting them together. ing.
- the signal system blocks of the wireless terminal devices TA to TH are controlled by the CPU 21.
- the CPU 21 executes a control program stored in the ROM 24 to control the entire wireless terminal device, and is obtained from commands and data input from the operation unit 27 via the I / O 22 and the baseband processing unit 17.
- the data is processed and temporarily stored in the RAM 23.
- the CPU 21 displays the command and data stored as necessary on the display unit 26 such as an LCD (Liquid Crystal Display). Further, the CPU 21 displays the current time obtained from the time measuring unit 25 on the display unit 26.
- the synchronization circuit 28 includes a PLL (Phase Locked Loop) circuit, and oscillates in synchronization with a synchronization signal included in a reception signal supplied from the baseband processing unit 17 and a communication frame periodically received. Operates and generates a synchronization signal that serves as a reference for the operation timing of the wireless terminal devices TA to TH. The synchronization circuit 28 further generates an operation clock synchronized with the synchronization signal and supplies it to the controller 20 and the like.
- the synchronization circuit 28 has a relatively long time constant, and once synchronization is established, the synchronization circuit 28 maintains the synchronization state for a certain period (for example, between 1 and 3 frame periods).
- controller 20 may be configured such that a rewritable nonvolatile memory card such as a flash memory in which unique identification information of the wireless terminal device is recorded is detachably mounted.
- a rewritable nonvolatile memory card such as a flash memory in which unique identification information of the wireless terminal device is recorded is detachably mounted.
- the transmission / reception switching unit 11 has its input end connected to the antenna ANTSR and its output end alternatively connected to the transmission unit 12 and the reception unit 16 according to the control of the CPU 21. Is done.
- the wireless terminal device When no transmission operation is performed by the operation unit 27, the wireless terminal device is in a reception (standby) mode, and the output terminal of the transmission / reception switching unit 11 is connected to the reception unit 16.
- the wireless terminal device when a transmission operation is performed by the operation unit 27, the wireless terminal device is in a transmission mode, and the output terminal of the transmission / reception switching unit 11 is connected to the transmission unit 12.
- the microphone 15 converts the user's voice input into an analog voice signal and outputs the analog voice signal to the A / D converter 14 in the transmission mode.
- the A / D conversion unit 14 converts the analog audio signal from the microphone 15 into a digital audio signal and outputs the digital audio signal to the baseband processing unit 13.
- the baseband processing unit 13 generates a communication frame (baseband signal) in a predetermined format based on the digital audio signal from the A / D conversion unit 14 or based on data stored in the RAM 23 of the controller 20.
- the communication frame is generated and output to the transmission unit 12.
- the transmission unit 12 modulates the carrier wave using the communication frame from the baseband processing unit 13 and transmits the modulated carrier wave to the repeater that is performing the relay operation via the transmission / reception switching unit 11 and the antenna ANTSR.
- GMSK Gausian Minimum Shift Keying
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- FSK Frequency Shift Keying
- the transmission / reception switching unit 11 connects the antenna ANTSR and the reception unit 16.
- the receiving unit 16 receives radio signals from the repeaters 111 1 to 111 n via the antenna ANTSR.
- the receiving unit 16 amplifies the received signal, performs signal processing such as demodulation processing, and outputs the demodulated signal to the baseband processing unit 17.
- the baseband processing unit 17 extracts a communication frame from the demodulated signal output from the receiving unit 16. Further, the baseband processing unit 17 outputs information on the header portion H of the extracted communication frame to the CPU 21.
- the CPU 21 analyzes the information of the header part H, and when the transmission destination of the received signal is its own station, the CPU 21 outputs the audio signal data included in the data part D to the D / A converter 18.
- the data other than the audio signal included in the data part D is temporarily stored in the RAM 23 and displayed on the display part 26 as necessary.
- the D / A converter 18 converts the audio signal from the baseband processor 17 from digital to analog and causes the speaker 19 to generate a sound.
- the repeaters 111 1 to 111 n are, as signal blocks, a transmission dedicated antenna ANTS, a transmission unit 32, a baseband processing unit 33, a reception dedicated antenna ANTR, a reception unit 36, and baseband processing.
- Each of the repeaters 111 1 to 111 n includes a controller 40, a timer unit 45, a display unit 46, and an operation unit 47 as control system blocks.
- the controller 40 includes a CPU (central processing unit) 41, an I / O (input / output unit) 42, a RAM (read / write memory) 43, a ROM (read only memory) 44, and an internal bus for connecting them together.
- the repeaters 111 1 to 111 n are provided with a bus I / F (interface) 9 for sending the information of its own device to a system bus 115 described later and acquiring information from other repeaters.
- the repeaters 111 1 to 111 n (for example, the repeater 111 1 ) perform signal processing such as amplification processing and waveform processing on the wireless signal received from the wireless terminal device that is the transmission source (for example, the wireless terminal device TA), and transmit destinations To the wireless terminal device (for example, the wireless terminal device TB).
- the repeaters 111 1 to 111 n basically have the same configuration as the wireless terminal devices TA to TH shown in FIG. Accordingly, components that are basically the same as the components of the wireless terminal devices TA to TH shown in FIG. .
- the repeaters 111 1 to 111 n are provided with a transmission-specific antenna ANTS and a reception-specific antenna ANTR.
- Each of the plurality of repeaters 111 1 to 111 n is connected to each other via a system bus 115 and connected to the server 104 via a communication line 116 such as an IP connection line as shown in FIG. Yes.
- the input unit 6 inputs data transmitted from the server 104 via the network I / F 8 under the input control of the CPU 41. Furthermore, when constructing a multi-site network that communicates with another site 100 constituting another communication area, a communication frame is received with a repeater at another site via the network I / F 8.
- the output unit 7 outputs data requested by the server 104 via the network I / F 8 under the control of the CPU 41. Furthermore, when constructing a multi-site network that communicates with another site 100 configuring another communication area, a communication frame is transmitted to a repeater at another site via the network I / F 8.
- the bus I / F 9 acquires the synchronization signal sent to the system bus 115 by the master repeater by the input control of the CPU 41, repeater information sent to the system bus 115 from other repeaters other than its own device, and the output wholesale of the CPU 41. It mediates the transmission of the information of its own device to the system bus 115.
- the synchronization circuit 48 includes a PLL circuit. When this repeater functions as a master repeater, it oscillates itself and generates a synchronization signal for the entire system.
- the synchronization signal is supplied to the controller 40 to serve as a reference timing for the operation, and is output onto the system bus 115 and transmitted to another repeater, as will be described later with reference to FIG.
- the synchronization circuit 48 oscillates in synchronization with a synchronization signal supplied via the bus I / F 9, generates an internal synchronization signal, and supplies the internal synchronization signal to the controller 40. .
- This internal synchronization signal serves as a reference timing for the operation of the repeater.
- FIG. 4 is a diagram showing a synchronization signal sent to the system bus 115 by the master repeater and slots corresponding to each subsequent repeater.
- one period of the synchronization signal is 80 ms
- the first 40 ms is composed of 32 slots from slot 0 to slot 31. Therefore, each slot has a time length of 1.25 ms.
- the first slot 0 contains a synchronization signal and is sent out by one repeater or master repeater 1111 specified according to a predetermined algorithm.
- the other repeaters 111 2 to 111 n become slave repeaters and acquire this synchronization signal.
- the repeaters 111 1 to 111 n that is, the repeater system 130 operates in synchronization with this synchronization signal. Any of slots 1 to 31 other than the slot 0 for synchronization is assigned to the repeaters 111 1 to 111 n .
- the repeaters 111 1 to 111 n write (output) the information of each repeater shared with each other (whether or not the relay channel is available, etc.) in the slot assigned to the own apparatus.
- the repeater 111 1 which is a master repeater sends a synchronization signal to the slot 0 and writes the information of the repeater 111 1 into the slot assigned to the repeater 111 1 among the slots 1 to 30.
- the last slot 31 is undefined here.
- FIG. 5 shows a format of a communication frame transmitted / received between the repeater and the wireless terminal device.
- FIG. 5A shows an example of a communication frame format when establishing a link with a call channel
- FIG. 5B shows an example of a communication frame format when voice and data are communicated.
- the format of a communication frame transmitted / received between the repeater and the wireless terminal device shown in FIGS. 5A and 5B is 80 ms, and is composed of 384 bits.
- P is a preamble (only at initial transmission)
- FSW is a frame synchronization word
- LICH link information
- SCCH signaling control
- FACCH high-speed accompanying control
- G is data of guard time.
- FIG. 6 is a flowchart showing the operation of the master repeater 111 1 (repeater 111 1 ).
- the master repeater 111 1 sends the synchronization signal output from the synchronization circuit 48 to slot 0 in FIG. 4, and the other repeaters 111 2 to 111 n serving as slave repeaters to the master repeater 111 1 It acquires a synchronization signal, repeater system 130 including the master repeater 111 1 operates in synchronism with the synchronizing signal.
- the synchronization signal is sent out on the system bus 115 every 80 ms, which is the same as the communication frame period.
- one repeater among the repeaters 111 1 to 111 n becomes a master repeater in accordance with a predetermined rule at the initial startup.
- the repeater 111 1 transmits a synchronization signal becomes the master repeater.
- the other repeaters 111 2 to 111 n automatically become slave repeaters and acquire a synchronization signal transmitted from the master repeater 1 .
- Any one of slots 1 to 30 is assigned to repeaters 111 1 to 111 n .
- the repeaters 111 1 to 111 n also know which slot the other repeaters are assigned to.
- the transmission of information to the allocation slot is timed by the synchronization circuit 48 and the timer 45.
- the synchronization signal is transmitted every 80 ms, and the information of the own device is transmitted by measuring the time between the synchronization signal transmission and the allocation slot. Based on these, transmission of the synchronization signal of the master repeater 111 1 and information indicating the state of the own apparatus and acquisition of information of the other repeaters 111 2 to 111 n will be described.
- step S101 the CPU 41 determines whether or not 80 ms has passed since the previous synchronization signal transmission, that is, whether or not the slot is slot 0 (step S101).
- a synchronization signal is written into (step S102). If it is determined in step S101 that 80 ms has not elapsed since the previous synchronization signal was sent, that is, if the slot is not slot 0, it is determined whether or not the slot is an assigned slot assigned to the own apparatus (step S103). If it is an allocation slot, the information of the own device is written into the allocation slot (step S104). If the slot is not an allocation slot, that is, if it is an allocation slot of another repeater, information on that slot is read (step S105). Next, the information in the RAM 43 is updated with the read information (step S106).
- FIG. 7 is a flowchart showing the operation of the slave repeater (repeaters 111 2 to 111 n ).
- Slave repeater 111 2 ⁇ 111 n is similar to the master repeater 111 1, and acquires the synchronization signal transmitted in slot 0, it runs in synchronization with the synchronizing signal. The elapsed time after the synchronization signal is output is counted by the timer 45.
- step S201 whether or not the current time slot is a slot to which a synchronization signal is transmitted, That is, it is determined from the time measured by the time measuring unit 45 whether the slot is 0 or not. If it is slot 0, the synchronization signal sent to slot 0 is acquired (step S202). In step S201, if it is not the slot 0 to which the synchronization signal is transmitted, the time is measured from the acquisition of the synchronization signal, and it is determined whether or not it is the timing of the allocation slot allocated to the own device (step S203). If it is an allocation slot, information on the own device is written into the allocation slot (step S204). If the slot is not an allocation slot, that is, if it is an allocation slot of another repeater, information on that slot is read (step S205). Next, the information in the RAM 43 is updated with the read information (step S206).
- each repeater 111 1 to 111 n first generates a transmission frame (step S301) and transmits the communication frame in synchronization with the synchronization signal. Transmit (step S302). That is, as shown in FIG. 9, this wireless communication system outputs a communication frame in synchronization with the synchronization signal.
- the synchronization circuit 28 of the wireless communication terminals TA to TH oscillates in synchronization with this communication frame. Therefore, the wireless communication terminals TA to TH are also operating in synchronization.
- the master repeater 111 1 is the period of the same 80ms communication frame length, and sends a synchronization signal to the system bus.
- the slave repeaters 111 2 to 111 n obtain the synchronization signal sent to this system bus.
- the repeaters 111 1 to 111 n operate in synchronization with this synchronization signal. Since the period of the synchronization signal with which the repeaters 111 1 to 111 n are synchronized is the same as the communication frame length, the repeaters 111 1 to 111 n can transmit a downlink signal synchronized with the synchronization signal.
- the channel on which the wireless terminal device makes a call is not a fixed channel, but is any one of the repeaters 111 1 to 111 n which is an empty channel among relay channels unique to the repeaters 111 1 to 111 n .
- a call permission request is made to one repeater, and the call is started when a response indicating that the call is permitted is received from the repeater that has made the call permission request. For this reason, the channel frequency must be changed.
- a frame synchronization signal of a communication frame is detected, and subsequent data is demodulated. For this reason, if the detection of the frame synchronization signal is delayed, the received data is cut off. Therefore, when the wireless communication system as in the embodiment is constructed by digital wireless communication, the wireless terminal device requires a PLL with a fast lock-up time, resulting in an increase in cost.
- the operations of the repeaters 111 1 to 111 n , the communication frames transmitted by the repeaters 111 1 to 111 n , and the operations of the wireless terminal devices TA to TH are synchronized. Further, once the synchronization circuit 28 of the wireless terminal devices TA to TH has a relatively long time constant, and once synchronization is established, even if there is a channel change or the like, for a while (for example, two communication frame periods, etc.) Stay synchronized. Therefore, the radio terminal apparatuses TA to TH can change channels while maintaining the synchronization state with respect to the communication frame. For this reason, even without using an expensive PLL with a fast lock-up time, it is possible to receive a communication frame without causing a head loss.
- the transmission process and the communication process correspond to the functions of the CPU 41 of the repeaters 111 1 to 111 n .
- the transmission process and the communication process can be configured by electronic circuits such as a transmission circuit and a communication circuit, respectively.
- circuit configuration or the like is also arbitrary, and various modifications such as configuring a part of a circuit configured by hardware by software or configuring a function configured by software by hardware are possible.
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Abstract
Description
通信回線を介して相互に接続され、各固有のチャンネルが割り当てられた複数の中継装置を備えた中継システムと、
該中継システムを介して通信を行う複数の無線端末装置と、を備え、
各中継装置は、自己に登録された無線端末装置に対して制御情報を送信し、
各無線端末装置は、自己が登録された中継装置より送信された前記制御情報を受信し、受信した制御情報に基づいて、各中継装置に割り当てられたチャンネルの中から中継可能な状態であるチャンネルを選択し、選択したチャンネルを介して他の無線端末装置との間の通信を行い、
各中継装置は、前記通信回線を介して通信信号を送受信することにより、前記制御情報を構成する情報を送受信し、該通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させ、各無線端末装置は、通信を行うチャンネルを他のチャンネルに移動したときに、該移動前のチャンネルにおいて確立した同期状態を少なくとも所定期間維持する、
ことを特徴とする。
前記スレーブ中継装置は、受信した同期信号に同期して発振する同期回路を備え、
マスター中継装置及びスレーブ中継装置は、同期信号に同期してダウンリンク信号を送信し、
前記無線端末装置は、受信したダウンリンク信号に同期する同期回路を備え、この同期回路は、確立した同期状態を1同期期間以上維持可能である、ことも可能である。
通信回線を介して相互に接続され、各固有の中継用チャンネルが割り当てられた複数の中継装置を備えた中継システムであって、
前記複数の中継装置に対して同期を取るための同期信号を前記通信回線に送出するマスター中継装置と、
前記通信回線を介して、前記マスター中継装置が送出した前記同期信号を取得し、前記同期信号に同期して稼働するスレーブ中継装置と、を備える、
ことを特徴とする。
通信回線に接続され、固有の中継用チャンネルが割り当てられた中継装置であって、
前記通信回線の通信信号中における自己の割り当て位置に、自己が保有する自己情報を出力する出力部と、
前記通信回線の通信信号中から他の中継装置が出力した他情報を入力する入力部と、
前記他情報に基づいて、自己が無線通信する無線端末装置を制御する制御情報を生成する処理部と、を備え、
前記処理部は、前記通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させるようにする、
ことを特徴とする。
通信回線を介して相互に接続され、各固有の中継用チャンネルが割り当てられた複数の中継装置を備えた中継システムと、該中継システムを介して通信を行う複数の無線端末装置と、を同期させる同期方法であって、
前記中継装置が、自己に登録された無線端末装置に対して制御情報を送信する送信工程と、
前記無線端末装置が、自己が登録された中継装置より受信した前記制御情報に基づいて、各中継装置に割り当てられたチャンネルの中から中継可能な状態であるチャンネルを選択して無線端末装置間の通信を行う通信工程と、を備え、
前記送信工程では、前記中継装置が、前記通信回線を介して前記制御情報を構成する情報を取得するとともに、該通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させるようにし、
前記通信工程では、前記無線端末装置が、通信を行うチャンネルを他のチャンネルに移動したときに、該移動前のチャンネルにおいて確立した同期状態を維持する、
ことを特徴とする。
図4は、マスタレピータによってシステムバス115に送出される同期信号及びそれに続く各レピータに対応するスロットを示す図である。図4に示すように、同期信号は、1周期が80msになっており、前半の40msは、スロット0からスロット31までの32個のスロットで構成されている。したがって、各スロットは1.25msの時間長になっている。最初のスロット0は同期信号を含み、決められたアルゴリズムに従って特定された1つのレピータすなわちマスタレピータ1111が送出する。他のレピータ1112~111nはスレーブレピータになって、この同期信号を取得する。レピータ1111~111n、すなわちレピータシステム130は、この同期信号に同期して動作している。レピータ1111~111nには、同期用のスロット0以外のスロット1~スロット31のいずれかが割り当てられている。レピータ1111~111nは、互いに共有する各レピータの情報(中継チャンネルが空きか否か等)を自装置に割り当てられたスロットに書き込む(出力する)。マスタレピータであるレピータ1111は、スロット0には同期信号を送出し、また、スロット1からスロット30のうちレピータ1111に割り当てられたスロットにレピータ1111の情報を書き込むことになる。なお、最後のスロット31は、ここでは、未定義とする。
1111~111n レピータ
100 サイト
104 サーバ
115 通信回線
130 レピータシステム
Claims (8)
- 通信回線を介して相互に接続され、各固有のチャンネルが割り当てられた複数の中継装置を備えた中継システムと、
該中継システムを介して通信を行う複数の無線端末装置と、を備え、
各中継装置は、自己に登録された無線端末装置に対して制御情報を送信し、
各無線端末装置は、自己が登録された中継装置より送信された前記制御情報を受信し、受信した制御情報に基づいて、各中継装置に割り当てられたチャンネルの中から中継可能な状態であるチャンネルを選択し、選択したチャンネルを介して他の無線端末装置との間の通信を行い、
各中継装置は、前記通信回線を介して通信信号を送受信することにより、前記制御情報を構成する情報を送受信し、該通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させ、各無線端末装置は、通信を行うチャンネルを他のチャンネルに移動したときに、該移動前のチャンネルにおいて確立した同期状態を少なくとも所定期間維持する、
ことを特徴とする無線通信システム。 - 前記通信回線における通信信号の単位長さと各中継装置が送信するダウンリンク信号の信号フレームの長さが同一に設定されている、
ことを特徴とする請求項1に記載の無線通信システム。 - 前記中継システムが、前記通信回線に同期信号を送出するマスター中継装置と、前記通信回線より同期信号を取得するスレーブ中継装置と、からなる、
ことを特徴とする請求項1に記載の無線通信システム。 - 前記マスター中継装置は、同期信号を生成する同期回路を備え、
前記スレーブ中継装置は、受信した同期信号に同期して発振する同期回路を備え、
マスター中継装置及びスレーブ中継装置は、同期信号に同期してダウンリンク信号を送信し、
前記無線端末装置は、受信したダウンリンク信号に同期する同期回路を備え、この同期回路は、確立した同期状態を1同期期間以上維持可能である、
ことを特徴とする請求項3に記載の無線通信システム。 - 前記各中継装置が、前記通信回線の通信信号中における自己の割り当て位置に、自己が保有する情報を送出し、さらに、前記各中継装置が、前記通信回線の通信フレーム中から他の中継装置が保有する情報を取得し、それに基づいて自己が無線送信する制御情報を構築する、
ことを特徴とする請求項1に記載の無線通信システム。 - 通信回線を介して相互に接続され、各固有の中継用チャンネルが割り当てられた複数の中継装置を備えた中継システムであって、
前記複数の中継装置に対して同期を取るための同期信号を前記通信回線に送出するマスター中継装置と、
前記通信回線を介して、前記マスター中継装置が送出した前記同期信号を取得し、前記同期信号に同期して稼働するスレーブ中継装置と、を備える、
ことを特徴とする中継システム。 - 通信回線に接続され、固有の中継用チャンネルが割り当てられた中継装置であって、
前記通信回線の通信信号中における自己の割り当て位置に、自己が保有する自己情報を出力する出力部と、
前記通信回線の通信信号中から他の中継装置が出力した他情報を入力する入力部と、
前記他情報に基づいて、自己が無線通信する無線端末装置を制御する制御情報を生成する処理部と、を備え、
前記処理部は、前記通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させるようにする、
ことを特徴とする中継装置。 - 通信回線を介して相互に接続され、各固有の中継用チャンネルが割り当てられた複数の中継装置を備えた中継システムと、該中継システムを介して通信を行う複数の無線端末装置と、を同期させる同期方法であって、
前記中継装置が、自己に登録された無線端末装置に対して制御情報を送信する送信工程と、
前記無線端末装置が、自己が登録された中継装置より受信した前記制御情報に基づいて、各中継装置に割り当てられたチャンネルの中から中継可能な状態であるチャンネルを選択して無線端末装置間の通信を行う通信工程と、を備え、
前記送信工程では、前記中継装置が、前記通信回線を介して前記制御情報を構成する情報を取得するとともに、該通信回線における通信信号に自己が無線送信するダウンリンク信号を同期させるようにし、
前記通信工程では、前記無線端末装置が、通信を行うチャンネルを他のチャンネルに移動したときに、該移動前のチャンネルにおいて確立した同期状態を維持する、
ことを特徴とする同期方法。
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CN103166677B (zh) * | 2013-02-04 | 2015-07-15 | 重庆邮电大学 | 一种用于带状拓扑的低压电力线载波通信中继方法 |
JP6414587B2 (ja) * | 2014-03-07 | 2018-10-31 | アイコム株式会社 | 中継装置、音声通信システム、音声信号の中継方法およびプログラム |
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US10531328B2 (en) | 2015-12-18 | 2020-01-07 | Agile Radio Management, Inc. | Adaptable ultra-narrowband software defined radio device, system, and method |
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